Gate valve



Nov. 27 1923.

1,475,191 l J. J. LEACH GATE v ALvE 2 Sheets-Sheet 1 Original Filed Feb. 5, 1919 INVENTUF;

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J. J. LEACH GATE VALVE Original Filed Feb. 5, 19m 2 Sheets-Sheet 2` INYBNTUR A UHN LTLEAEH www ATTDHNEY- Patented Nov. 27, 1923.

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JOHN. LEACH, INDIAN ORGHARD, MASSACHSETTS.

GATE VALVE.

Application led February 3, 1919, Serial No. 274,808. Renewed March 5,1921. Serial No. 449,769.

provements in Gate Valves, of which the following is a full7 clear7 and exact description.

in valves and particularly in means for taking up wear of the valve against its seat. One of the objects of the invention is the provision of a valve. consisting of relatively movable parts working against a seat, and means for expanding said parts relative to each other, so as to take up wear dueto the movement of the valve parts against the seat.

Another object ofthe invention is the provision of a valve, wherein the movable valve parts are positively connected to an operating screw, by means of links, wherebythe movable valve parts will be'prevented from becoming detached and injuring the turbine mechanism to which the feed line is con-v nected.

Another Objent'nf the invention in the, provision of a gate valve, wherein relatively.

movable valve parts are employed to work against the valve seat, with a screw rod working within the main valve screw rod,4

and connected by means of spreader links with the movable valve parts, whereby thek valve parts may be pressed against the valve i seat when it is necessaryto take up wear, by-

perating the inner screw rod from the outside of the valve casing. Y

'With the above and other objects in view the invention consists in certain new and `useful combinations,' constructions` arrangements Vof parts, clearly `described yin the following specification and fully illustratedrin the accompanying drawings, in which :-y f

Fig. 1 is a vertical sectional view through a gate valve constructed in accordance with my invention.

Fig. 2 is a detail horizontal sectional view takenthrough the` lower part'of the Smaller valve lock.

Fig. 3 is a detailfview'y of the .movable valve parts and the coupling sleeve or ring Y n 4 f I On the casing 19 the standards 24 are con- `nected,so 'as to provide a horizontal bearing therefor.

and

lovver end of the main operating shaft or ro Y Referring to the accompanying drawings, showing the application of the invention to a standard gate valve` such as is commonly employed for controlling'the flow of steam, 5 designates the casing of the valve.y which is formed with tubular end portions-6 and 7,

y designed to be connected to the feed line, as This invention relates to improvementsV Aa tubular flange or extension of the valve element 13. The valve element 12 is formed with a circular end wall 12a which engages the valve seat 107 and the valve element 18 is formed with a circularlend wall 13a which engages the valve seat 11. A ring or coupling sleeve 14 embraces the interfitting tubular sections of the valve elements 12 and "13, and is equipped with Yan offset nipple 15 inwhichthe lowerV end of the operating rod 16 is threaded or connected; this rod being shown to have external screw threads 16a along its upper end portion', which are engaged b v the nut 17. enlarged to provide an Ioperating'wheel 18. by the turning of which the rod 16v/ill be shifted, so as to lift the valveelements 12 and 13 vclear of the seat, or toreturn said elements to' their seats.

On the flange 9'the case section 19 is -mounted, being connected thereto by means `of the bolts 20, as in the usual practice. The upper portion of this casing is reduced to provide a bearing for the' operating rod 16, a bushing 21 being Iprovided for this purpose. A gland 22 is provided on theY upper end of the casirig19, being equipped with the screw boltsf23. whereby a steam t tight joint may be provided around the rod 1G.- the .packing 22a of said gland engaging vthefinternal "shoulder 22bK-formed on the casingf19.

vided'with trunnions 29, which are engagedf by the yokes andl, each yoke having slots nions 29. The yolres 30 and 31 are provided with upwardly and f outwardly'. inolined" arms 33 which" are A pivotally secured to the ears-or bearing lugs 34 and 35 ofthe valve elements 12 and" 13."

- Afnut 3G is' threaded on the .upperY end of the inncrf rod27 andjcarri'esan operating element 87,whichfisshown' to beiin the form of a small wheel,- butf-which may bea lever or anyotherl similar device. By turning-the operating element 3:7 the nut- 28 Jwiljl be liftedV relatively to the valve elements-.12 vand 13 so. that theiva'lve elements will be moved more vsnugly against their seats.

The Avalve elements*` 12 and: 13' are .positively` anchored :to theA inner screwf. rod, so that? they will' noti become detached'and under. `vthe high steam 'pressure'iforced' out of the'valve casing intothe line.

In Figs. 3 and 4I showy aV modiedform of the invention, wherein the roclfor 'operatthe means for forcing the valves against theirseet does `not shiftllongitudinally, and

companion ynuts' are'. employedto operate'` links for causingthe valves to shiftor move apart from each other to follow or take-up wear. Y

Referring to the accompanyingv drawings, particularly Fig.' 3, 40-`designates valve Vand 41 the" leftvalve, which` work againstl vthe Aseats 4017a-nd-A 41C, respectively, in thema-nner' previously described Y or ears40" and 40b',farrangedover eachother, and the valve 41'isvequip'ped with bearing lugs or ears 41?L aiid41marranged.over each other;v each Ivalve" being of tubular formation anclpiovided with anV end wal-140% similar to that described with`r reference to Fig.

'An operating-rodY 42 extends downwardly n between" the. l valves:A and` `through the; right nut 43j ands-the leftjv nut 445 Thef rod'42y isl provided -witlfrav threaded 'enlargement 42al y designed/fte engage`r the-` nut 143, and.v is provided withaf screw.V thread 44a designed to Y engage-thenu-t 44.

The upper nut 43% is providedv withtrunnions 43?"whij'ch are engaged-'by the upper ber 41, respectively. The lowenfnut'44vis the right ends of these yokes are pivoted on the lugs 40 ofthe member 40andthelugs 41b of the member 41, respectively.y

The operating rod 42 extends through the sleeveshaft 49, the wheel nut 51 leading from'the'ringO on'its upper end the latter surrounding the valves 40 and 41 whereby the shaft 49 may bev lifted in the valve easing, sov as tomovc the valvesfrom their seats, or lowered to move the valve to their seats.

The` yokes connected lwith the upper. and lowerlllnuts are preferablyformed so that their outer ends-widen'toward the end' walls ofthe valves, thusproviding ay wide bearing against the? valves. Theinne'r .operating rod or shaft 42 'is Vconnected to the sleeve` shaft 49 solthatwit willnotshift longitudinally therein, and for this purpose a stop `nut49 is provided :onf the.: rodv or'. shaft' 42: for enl gaging. the c coupling ring 51?,` land Athuslimit the longitudinalf movement ofv the: inner rod42;

The operating rod f 42 is equippedfwith a nut 53fonits-upper. end, saidnut beingV equipped withalever l'whiohenables the opera-tor tot-urn the rodiorJ shaft 42," so as to move the upper and lower nuts thereon, whereby the valves will be moved against ytheir 'seats't'o ltake. up wear.

yItl will'` be seen,v therefore, that the rod 42 has little or ino I strain placeclmpon it, and thatconsiderable leverage is developed b'etween the nutsff`43`and 4.4i and theV valves, through-:the links? connecting saidlnuts. to the .valvesgi it'l being' understood zthat the arms of the yokes connected to the trunnions of thenuts-are'slotted asfinithe construction shownLinFigs. 1and2.v f

,The generalconstruetion ofthe valve cas-y ing-*forthe valves 40 a-11di41 mayfollo'w the lines: deseribedwith reference to the `showing ofFig. 1',v or otherwise, asfjudgmentfmay The valve 4()y is equipped with bearingA lugsv l and to effectr a uniform lateral adjustmentv` ofthe valves Vagainst the seats.

'2.fA valve; constructionviconsisting of a y rvalve casing having spaced valve seats, inter-fitting: valves-- sliding against the seats, a

shaft, al coupling connecting .the shaft tothe valves, means for operating the.fshaft-to '1nove the? valves against their seats, ai shaft in; the si-1a .fft,\l nutsyvon the seconde-shaft, and links connecting the nuts to thevalves,

threaded engagement with the nuts, whereby said nuts will move in opposite directions when the shaft is rotated, so that the valves may be moved against their seats to'take up wear.

3. A valve construction including a casing having opposing valve seats, valve members slidable on each other and slidable across the seats, a yoke embracing said valve members, a sleeve shaft coupled to said yoke, a bearing support for said sleeve shaft, an operating wheel threaded on the upper end of said sleeve shaft for shifting said shaft in said bearing support, a shaft extending through the sleeve shaft and formed with a lower end portion having` right and left screwthreads, a nut threaded on the right screw threads of said lower end portion, a nut threaded on the left screw threads of said lower end portion, links connected with the first nut and the upper portions of said valve members, links connected with the second nut and the lower portions of said valve members and means for operating said last shaft, whereby the uniform adjustment of the valve members against the entire surfaces of the valve seats may be effected. Y

Signed by me at Springfield, Mass.

JOHN J. LEACH. 

